如何为多个选择下拉列表添加实体化筹码？

Question

<table class="table table-striped table-hover">
    <thead>
      <tr>
        <th>E-mail</th>
        <th>Voornaam</th>
        <th>Achternaam</th>
        <th>Delete</th>
      </tr>
    </thead>
    <tbody>
      <tr *ngFor="let user of users | filterPipeUsers: searchToken">
        <td (click)="SpecificUser(user.userId)">{{user.username}}</td>
        <td (click)="SpecificUser(user.userId)">{{user.firstName}}</td>
        <td (click)="SpecificUser(user.userId)">{{user.lastName}}</td>
        <td><a (click)="Debug()"><img class="delete"
              src="https://cdn4.iconfinder.com/data/icons/controls-add-on-flat/48/Contols_-_Add_On-35-512.png" /></a>
        </td>
      </tr>
    </tbody>
  </table>

table {
  -webkit-border-radius: 8px !important;
  -moz-border-radius: 8px !important;
  border-radius: 8px !important;
  background-color: rgba(245, 245, 245, 0.644);
  color: black;
}

thead {
  background-color: rgb(245, 245, 245);
  color: black;
}

tbody {
  display: block;
  overflow-y: auto;
  width: 100%;
  height: 350px;
}

tr {
  display: block;
  width: 100%;
}

当我选择了多个选项时，这是我的选择代码，应该以筹码格式添加。